Holographic Versatile Disc

The holographic versatile disc is designed using advanced optical disc technology, the holographic versatile disc employs a technique known as collinear holography, in which two lasers one red and one blue-green, are used in a single beam. The blue-green laser is used to read data from a holographic layer to the top of the disc and the red laser is used to read servo information from a CD layer near the bottom.

The servo information is used to monitor the position of the read head over the disc and sector information on a hard disk drive. The servo information is interspersed amongst the data. A mirror layer is formed between the holographic data and the servo data letting the red laser to pass through it. This prevents interference from refraction of the blue-green laser off the servo data pits and is an advance over past holographic storage media, which either experienced too much interference, or lacked the servo data entirely, making them incompatible with current CD and the DVD drive technology disks have the capacity to hold up to 3.9 terabytes of information which is eighty times the capacity of Disc.

The holographic versatile disc has a transfer rate of 1 Gbit/s. The holographic versatile disc uses holographic memory around for more than 40 years, several characteristics is difficult to implement in a consumer market. in most of these systems send the reference beam and the information beam are let into the recording medium on different axes.

In holographic versatile disc, the holographic storage systems has no data, the beam carrying data has a change of interfere with the holography process. The holographic memory discs have notably thicker CDs and DVDs. holographic versatile disc is fit for the market.

The holographic versatile disc system has the laser beams which travel in the same axis and strike the recording medium at the same angle. In, the holographic versatile disc test system, the servo data is carried in a red laser. The size and thickness of an holographic versatile disc is compatible with CDs and DVDs.

Holography is a method of recording patterns of light to produce a three dimensional object. The patterns of light are called a hologram. The process of creating a hologram begins with a focused beam of light -- a laser beam. This laser beam is split into two separate beams: a reference beam, which remains unchanged throughout much of the process, and an information beam, which passes through an image. When light encounters an image, its composition changes and the image is captured in its waveforms. When these two beams intersect, it creates a pattern of light interference. If you record this pattern of light interference in a layer of a disc you are recording the light pattern of the image.

To retrieve the information stored in a holographic versatile disc, the reference beam is applied directly onto the hologram. When it reflects off the hologram, it holds the light pattern of the image stored there. The holographic memory systems use holograms to store digital instead of analog information. The holographic versatile disc structure has the following: a green writing, Red positioning laser, Hologram, Poly carbon layer, Photo polymeric layer, Distance layers, Diachronic layer, Aluminum reflective layer, Transparent base, PIT.

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